155 km SSE of Perryville, Alaska

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 11,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
3. Magna, Utah 2020 M 5.7 350× the energy of this one
4. This earthquake M 4.0 about 15 tons of TNT
5. Around the size people start to feel M 3.0 this one released 32× more

Energy from the Gutenberg–Richter relation (log₁₀E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 54.6157, -158.2438. Map © OpenStreetMap contributors.

Aftershocks so far

53 earthquakes have been recorded within 50 km since this one.

1. 2.7 161 km SSE of Perryville, Alaska 08:47 UTC
2. 2.3 110 km SSE of Perryville, Alaska 01:42 UTC
3. 2.7 126 km SSE of Perryville, Alaska 04:09 UTC
4. 2.3 131 km SE of Perryville, Alaska 20:30 UTC
5. 2.9 129 km SSE of Perryville, Alaska 18:34 UTC
6. 2.5 151 km SE of Perryville, Alaska 09:37 UTC
7. 2.1 112 km SSE of Perryville, Alaska 22:12 UTC
8. 3.1 119 km S of Perryville, Alaska 02:08 UTC
9. 2.0 147 km SSE of Perryville, Alaska 17:28 UTC
10. 1.8 112 km SSE of Perryville, Alaska 13:51 UTC
11. 3.2 south of Alaska 21:23 UTC
12. 2.8 178 km SSE of Perryville, Alaska 09:00 UTC
13. 3.0 161 km SSE of Perryville, Alaska 19:02 UTC
14. 3.4 118 km SSE of Perryville, Alaska 00:56 UTC
15. 3.1 123 km SSE of Perryville, Alaska 06:07 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 22:55 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 5.6 on 2021-10-31 — it released about 250 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

• The official USGS event page — the source of record for every value above
• Did you feel it? Report it to USGS — reports go to USGS, not to us
• ShakeMap for this event, when USGS has produced one

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.